Add tests for current_user and return None if unavailable
Improve docs
Add response_handler hook/decorator

Allows for custom response formatting
Merge pull request #12 from svenstaro/current_user-stuff

Add tests for current_user and return None if unavailable
Merge pull request #11 from svenstaro/improve-docs

Improve docs
Merge pull request #13 from sloria/response-handler

Add response_handler hook/decorator